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The OE cables are pretty low quality in my Jeep. They were also about 22 years old, so they probably should have been replaced anyway. I don't know how important the grounding connections are but in my Jeep they were just flimsy wires. They were upgraded with the cables. And I suppose that I neglected to say that other mods I have done during the last 12 months include roof rack delete, synthetic oil in the front differential, and maybe my CAI. However, I believe that is negated by me doing significantly less highway driving. I see the mpg I am getting as quite an improvement and I attribute it to having new heavy duty battery cables. Even in the weeks preceding my project I was not getting very good mpg.
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